OPC Specific Properties

"Item Canonical DataType"The
data type of the item as stored on the OPC server. This property is
also exposed in the CanonicalDataType property
of the daitem object.

2

"Item Value"The value that
was last obtained from the OPC server for the item. This property
is the same as the Value property
of the daitem object. Querying this property behaves
like a read operation from the
device.

3

"Item Quality"The quality
of the item's Value property. This property is
the same as the Quality property
of the daitem object. Querying this property behaves
like a read operation from the
device.

4

"Item Timestamp"The time
that the Value and Quality was obtained by the device (if this
is available) or the time the server updated or validated the Value and Quality in
its cache. This property is the same as the TimeStamp property
of the daitem object. Querying this property behaves
like a read operation from the
device.

5

"Item Access Rights"The
ability of the server to read or write data to this item.

6

"Server Scan Rate"Represents
the fastest rate at which the server could obtain data from the underlying
data source. The accuracy of this value could be affected by system
load and other factors, and is not a guaranteed rate.